添加W粉对YG20C硬质合金组织及性能的影响
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摘要
以在混合料阶段添加W粉与否的两种YG20C硬质合金为实验对象,研究了经不同烧结温度后W粉对合金常规性能(磁力、洛氏硬度、抗弯强度等)及显微组织的影响。结果表明:W粉的添加会促进YG20C硬质合金的晶粒长大,甚至导致异常粗晶的产生;添加W粉的合金γ相中固溶的W(或WC)的量从1 410℃的10.5%降至1 480℃的10%,而未添加W粉的合金从10.4%升至11.6%;此外,添加W粉的合金的抗弯强度随烧结温度的升高而大幅降低,从1 410℃升至1 480℃时降幅达到580 N/mm~2,而未添加W粉的合金的抗弯强度基本稳定在2 500 N/mm~2。
Using two kinds of YG20 C cemented carbides with or without W powder added in the mixing stage as experimental subjects,the effects of W powder on the conventional properties(magnetic force,Rockwell hardness,flexural strength,etc.) and microstructure of the alloy after sintering at different temperatures were studied.The results show that the addition of W powder can promote the grain growth of YG20 C cemented carbide and even lead to the formation of abnormal coarse grains; The amount of solid solution W(or WC) in the γ phase of the alloy with W powder decreased from 10.5% at 1 410 ℃ to 10% at 1 480 ℃,while that without W powder increased from 10.4% to 11.6%;The bending strength of the alloy with W powder decreases sharply with the increase of the sintering temperature,and the decreasing amplitude reaches 580 N/mm~2 from 1 410 ℃ to 1 480 ℃,while that without W powder is basically stable at 2 500 N/mm~2.
Using two kinds of YG20 C cemented carbides with or without W powder added in the mixing stage as experimental subjects,the effects of W powder on the conventional properties(magnetic force,Rockwell hardness,flexural strength,etc.) and microstructure of the alloy after sintering at different temperatures were studied.The results show that the addition of W powder can promote the grain growth of YG20 C cemented carbide and even lead to the formation of abnormal coarse grains; The amount of solid solution W(or WC) in the γ phase of the alloy with W powder decreased from 10.5% at 1 410 ℃ to 10% at 1 480 ℃,while that without W powder increased from 10.4% to 11.6%;The bending strength of the alloy with W powder decreases sharply with the increase of the sintering temperature,and the decreasing amplitude reaches 580 N/mm~2 from 1 410 ℃ to 1 480 ℃,while that without W powder is basically stable at 2 500 N/mm~2.
引文
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[15] ENGEL U,HüBNER H.Strength improvement of cemented carbides by hot isostatic pressing (HIP)[J].Journal of Materials Science,1978,13(9):2 003-2 012.
[2] KONYASHIN I,SCH?FER F,COOPER R,et al.Novel ultra-coarse hardmetal grades with reinforced binder for mining and construction[J].International Journal of Refractory Metals & Hard Materials,2005,23(4):225-232.
[3] 王忆民,李锐,曹群.碳含量对WC-Ni-Co-Cr硬质合金组织与性能的影响[J].硬质合金,2014,31(5):265-270.
[4] 肖逸锋,贺跃辉,丰平,等.碳含量对缺碳硬质合金组织和性能的影响[J].中国有色金属学报,2007,17(1):39-44.
[5] 吴翔,廖军,刘方舟.不同工艺条件对WC-20%Co硬质合金性能的影响[J].湖南有色金属,2013,29(1):44-46.
[6] 龙坚战.烧结温度和时间对WC-24%Co硬质合金的WC晶粒形貌影响[J].硬质合金,2017(6).
[7] 陈楚轩.硬质合金质量控制原理[M].中国钨业协会硬质合金分会自贡硬质合金有限责任公司,2007:154.
[8] WITTMANN B,SCHUBERT W D,LUX B.WC grain growth and grain growth inhibition in nickel and iron binder hardmetals[J].International Journal of Refractory Metals & Hard Materials,2002,20(1):51-60.
[9] 马淳安,褚有群,黄辉,等.WC-Co硬质合金的相组成及其相变[J].浙江工业大学学报,2003,31(1):1-6.
[10] 李晋尧,何平.WC-Co硬质合金断裂源的观察与分析[J].理化检验(物理分册),1995(1):52-53.
[11] 范有明,时章明,陈祎.WC-Co硬质合金矫顽磁力与最高烧结温度关系的研究[J].稀有金属与硬质合金,2007,35(2):18-20.
[12] 王国栋.硬质合金生产原理[M].冶金工业出版社,1988.
[13] 沈志农.非均匀WC颗粒对YG20C合金力学性能与组织结构的影响[J].金属材料与冶金工程,2011,39(3):3-5.
[14] 蒙世合,罗海辉,彭宇.WC晶粒离散度对WC-Co硬质合金断裂韧性的影响[J].硬质合金,2017,34(1):14-20.
[15] ENGEL U,HüBNER H.Strength improvement of cemented carbides by hot isostatic pressing (HIP)[J].Journal of Materials Science,1978,13(9):2 003-2 012.